515 lines
18 KiB
C
515 lines
18 KiB
C
/*
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* linux/percpu-defs.h - basic definitions for percpu areas
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*
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* DO NOT INCLUDE DIRECTLY OUTSIDE PERCPU IMPLEMENTATION PROPER.
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*
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* This file is separate from linux/percpu.h to avoid cyclic inclusion
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* dependency from arch header files. Only to be included from
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* asm/percpu.h.
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*
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* This file includes macros necessary to declare percpu sections and
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* variables, and definitions of percpu accessors and operations. It
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* should provide enough percpu features to arch header files even when
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* they can only include asm/percpu.h to avoid cyclic inclusion dependency.
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*/
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#ifndef _LINUX_PERCPU_DEFS_H
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#define _LINUX_PERCPU_DEFS_H
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#ifdef CONFIG_SMP
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#ifdef MODULE
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#define PER_CPU_SHARED_ALIGNED_SECTION ""
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#define PER_CPU_ALIGNED_SECTION ""
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#else
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#define PER_CPU_SHARED_ALIGNED_SECTION "..shared_aligned"
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#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
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#endif
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#define PER_CPU_FIRST_SECTION "..first"
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#else
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#define PER_CPU_SHARED_ALIGNED_SECTION ""
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#define PER_CPU_ALIGNED_SECTION "..shared_aligned"
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#define PER_CPU_FIRST_SECTION ""
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#endif
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/*
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* Base implementations of per-CPU variable declarations and definitions, where
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* the section in which the variable is to be placed is provided by the
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* 'sec' argument. This may be used to affect the parameters governing the
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* variable's storage.
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*
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* NOTE! The sections for the DECLARE and for the DEFINE must match, lest
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* linkage errors occur due the compiler generating the wrong code to access
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* that section.
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*/
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#define __PCPU_ATTRS(sec) \
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__percpu __attribute__((section(PER_CPU_BASE_SECTION sec))) \
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PER_CPU_ATTRIBUTES
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#define __PCPU_DUMMY_ATTRS \
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__attribute__((section(".discard"), unused))
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/*
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* s390 and alpha modules require percpu variables to be defined as
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* weak to force the compiler to generate GOT based external
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* references for them. This is necessary because percpu sections
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* will be located outside of the usually addressable area.
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*
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* This definition puts the following two extra restrictions when
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* defining percpu variables.
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*
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* 1. The symbol must be globally unique, even the static ones.
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* 2. Static percpu variables cannot be defined inside a function.
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*
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* Archs which need weak percpu definitions should define
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* ARCH_NEEDS_WEAK_PER_CPU in asm/percpu.h when necessary.
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*
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* To ensure that the generic code observes the above two
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* restrictions, if CONFIG_DEBUG_FORCE_WEAK_PER_CPU is set weak
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* definition is used for all cases.
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*/
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#if defined(ARCH_NEEDS_WEAK_PER_CPU) || defined(CONFIG_DEBUG_FORCE_WEAK_PER_CPU)
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/*
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* __pcpu_scope_* dummy variable is used to enforce scope. It
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* receives the static modifier when it's used in front of
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* DEFINE_PER_CPU() and will trigger build failure if
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* DECLARE_PER_CPU() is used for the same variable.
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*
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* __pcpu_unique_* dummy variable is used to enforce symbol uniqueness
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* such that hidden weak symbol collision, which will cause unrelated
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* variables to share the same address, can be detected during build.
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*/
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#define DECLARE_PER_CPU_SECTION(type, name, sec) \
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extern __PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \
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extern __PCPU_ATTRS(sec) __typeof__(type) name
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#define DEFINE_PER_CPU_SECTION(type, name, sec) \
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__PCPU_DUMMY_ATTRS char __pcpu_scope_##name; \
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extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
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__PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \
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extern __PCPU_ATTRS(sec) __typeof__(type) name; \
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__PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES __weak \
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__typeof__(type) name
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#else
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/*
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* Normal declaration and definition macros.
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*/
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#define DECLARE_PER_CPU_SECTION(type, name, sec) \
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extern __PCPU_ATTRS(sec) __typeof__(type) name
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#define DEFINE_PER_CPU_SECTION(type, name, sec) \
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__PCPU_ATTRS(sec) PER_CPU_DEF_ATTRIBUTES \
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__typeof__(type) name
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#endif
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/*
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* Variant on the per-CPU variable declaration/definition theme used for
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* ordinary per-CPU variables.
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*/
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#define DECLARE_PER_CPU(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, "")
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#define DEFINE_PER_CPU(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, "")
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/*
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* Declaration/definition used for per-CPU variables that must come first in
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* the set of variables.
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*/
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#define DECLARE_PER_CPU_FIRST(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
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#define DEFINE_PER_CPU_FIRST(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
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/*
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* Declaration/definition used for per-CPU variables that must be cacheline
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* aligned under SMP conditions so that, whilst a particular instance of the
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* data corresponds to a particular CPU, inefficiencies due to direct access by
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* other CPUs are reduced by preventing the data from unnecessarily spanning
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* cachelines.
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*
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* An example of this would be statistical data, where each CPU's set of data
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* is updated by that CPU alone, but the data from across all CPUs is collated
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* by a CPU processing a read from a proc file.
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*/
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#define DECLARE_PER_CPU_SHARED_ALIGNED(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
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____cacheline_aligned_in_smp
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#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
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____cacheline_aligned_in_smp
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#define DECLARE_PER_CPU_ALIGNED(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
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____cacheline_aligned
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#define DEFINE_PER_CPU_ALIGNED(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION) \
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____cacheline_aligned
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/*
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* Declaration/definition used for per-CPU variables that must be page aligned.
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*/
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#define DECLARE_PER_CPU_PAGE_ALIGNED(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, "..page_aligned") \
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__aligned(PAGE_SIZE)
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#define DEFINE_PER_CPU_PAGE_ALIGNED(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, "..page_aligned") \
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__aligned(PAGE_SIZE)
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/*
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* Declaration/definition used for per-CPU variables that must be read mostly.
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*/
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#define DECLARE_PER_CPU_READ_MOSTLY(type, name) \
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DECLARE_PER_CPU_SECTION(type, name, "..read_mostly")
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#define DEFINE_PER_CPU_READ_MOSTLY(type, name) \
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DEFINE_PER_CPU_SECTION(type, name, "..read_mostly")
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/*
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* Intermodule exports for per-CPU variables. sparse forgets about
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* address space across EXPORT_SYMBOL(), change EXPORT_SYMBOL() to
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* noop if __CHECKER__.
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*/
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#ifndef __CHECKER__
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#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(var)
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#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(var)
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#else
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#define EXPORT_PER_CPU_SYMBOL(var)
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#define EXPORT_PER_CPU_SYMBOL_GPL(var)
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#endif
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/*
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* Accessors and operations.
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*/
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#ifndef __ASSEMBLY__
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/*
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* __verify_pcpu_ptr() verifies @ptr is a percpu pointer without evaluating
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* @ptr and is invoked once before a percpu area is accessed by all
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* accessors and operations. This is performed in the generic part of
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* percpu and arch overrides don't need to worry about it; however, if an
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* arch wants to implement an arch-specific percpu accessor or operation,
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* it may use __verify_pcpu_ptr() to verify the parameters.
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*
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* + 0 is required in order to convert the pointer type from a
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* potential array type to a pointer to a single item of the array.
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*/
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#define __verify_pcpu_ptr(ptr) \
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do { \
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const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL; \
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(void)__vpp_verify; \
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} while (0)
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#ifdef CONFIG_SMP
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/*
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* Add an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE()
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* to prevent the compiler from making incorrect assumptions about the
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* pointer value. The weird cast keeps both GCC and sparse happy.
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*/
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#define SHIFT_PERCPU_PTR(__p, __offset) \
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RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset))
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#define per_cpu_ptr(ptr, cpu) \
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({ \
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__verify_pcpu_ptr(ptr); \
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SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu))); \
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})
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#define raw_cpu_ptr(ptr) \
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({ \
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__verify_pcpu_ptr(ptr); \
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arch_raw_cpu_ptr(ptr); \
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})
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#ifdef CONFIG_DEBUG_PREEMPT
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#define this_cpu_ptr(ptr) \
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({ \
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__verify_pcpu_ptr(ptr); \
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SHIFT_PERCPU_PTR(ptr, my_cpu_offset); \
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})
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#else
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#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
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#endif
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#else /* CONFIG_SMP */
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#define VERIFY_PERCPU_PTR(__p) \
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({ \
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__verify_pcpu_ptr(__p); \
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(typeof(*(__p)) __kernel __force *)(__p); \
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})
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#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); })
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#define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
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#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
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#endif /* CONFIG_SMP */
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#define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
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/*
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* Must be an lvalue. Since @var must be a simple identifier,
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* we force a syntax error here if it isn't.
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*/
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#define get_cpu_var(var) \
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(*({ \
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preempt_disable(); \
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this_cpu_ptr(&var); \
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}))
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/*
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* The weird & is necessary because sparse considers (void)(var) to be
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* a direct dereference of percpu variable (var).
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*/
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#define put_cpu_var(var) \
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do { \
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(void)&(var); \
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preempt_enable(); \
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} while (0)
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#define get_cpu_ptr(var) \
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({ \
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preempt_disable(); \
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this_cpu_ptr(var); \
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})
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#define put_cpu_ptr(var) \
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do { \
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(void)(var); \
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preempt_enable(); \
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} while (0)
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/*
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* Branching function to split up a function into a set of functions that
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* are called for different scalar sizes of the objects handled.
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*/
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extern void __bad_size_call_parameter(void);
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#ifdef CONFIG_DEBUG_PREEMPT
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extern void __this_cpu_preempt_check(const char *op);
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#else
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static inline void __this_cpu_preempt_check(const char *op) { }
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#endif
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#define __pcpu_size_call_return(stem, variable) \
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({ \
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typeof(variable) pscr_ret__; \
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__verify_pcpu_ptr(&(variable)); \
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switch(sizeof(variable)) { \
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case 1: pscr_ret__ = stem##1(variable); break; \
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case 2: pscr_ret__ = stem##2(variable); break; \
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case 4: pscr_ret__ = stem##4(variable); break; \
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case 8: pscr_ret__ = stem##8(variable); break; \
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default: \
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__bad_size_call_parameter(); break; \
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} \
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pscr_ret__; \
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})
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#define __pcpu_size_call_return2(stem, variable, ...) \
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({ \
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typeof(variable) pscr2_ret__; \
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__verify_pcpu_ptr(&(variable)); \
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switch(sizeof(variable)) { \
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case 1: pscr2_ret__ = stem##1(variable, __VA_ARGS__); break; \
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case 2: pscr2_ret__ = stem##2(variable, __VA_ARGS__); break; \
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case 4: pscr2_ret__ = stem##4(variable, __VA_ARGS__); break; \
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case 8: pscr2_ret__ = stem##8(variable, __VA_ARGS__); break; \
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default: \
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__bad_size_call_parameter(); break; \
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} \
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pscr2_ret__; \
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})
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/*
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* Special handling for cmpxchg_double. cmpxchg_double is passed two
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* percpu variables. The first has to be aligned to a double word
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* boundary and the second has to follow directly thereafter.
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* We enforce this on all architectures even if they don't support
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* a double cmpxchg instruction, since it's a cheap requirement, and it
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* avoids breaking the requirement for architectures with the instruction.
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*/
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#define __pcpu_double_call_return_bool(stem, pcp1, pcp2, ...) \
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({ \
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bool pdcrb_ret__; \
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__verify_pcpu_ptr(&(pcp1)); \
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BUILD_BUG_ON(sizeof(pcp1) != sizeof(pcp2)); \
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VM_BUG_ON((unsigned long)(&(pcp1)) % (2 * sizeof(pcp1))); \
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VM_BUG_ON((unsigned long)(&(pcp2)) != \
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(unsigned long)(&(pcp1)) + sizeof(pcp1)); \
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switch(sizeof(pcp1)) { \
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case 1: pdcrb_ret__ = stem##1(pcp1, pcp2, __VA_ARGS__); break; \
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case 2: pdcrb_ret__ = stem##2(pcp1, pcp2, __VA_ARGS__); break; \
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case 4: pdcrb_ret__ = stem##4(pcp1, pcp2, __VA_ARGS__); break; \
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case 8: pdcrb_ret__ = stem##8(pcp1, pcp2, __VA_ARGS__); break; \
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default: \
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__bad_size_call_parameter(); break; \
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} \
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pdcrb_ret__; \
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})
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#define __pcpu_size_call(stem, variable, ...) \
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do { \
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__verify_pcpu_ptr(&(variable)); \
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switch(sizeof(variable)) { \
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case 1: stem##1(variable, __VA_ARGS__);break; \
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case 2: stem##2(variable, __VA_ARGS__);break; \
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case 4: stem##4(variable, __VA_ARGS__);break; \
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case 8: stem##8(variable, __VA_ARGS__);break; \
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default: \
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__bad_size_call_parameter();break; \
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} \
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} while (0)
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/*
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* this_cpu operations (C) 2008-2013 Christoph Lameter <cl@linux.com>
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*
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* Optimized manipulation for memory allocated through the per cpu
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* allocator or for addresses of per cpu variables.
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*
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* These operation guarantee exclusivity of access for other operations
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* on the *same* processor. The assumption is that per cpu data is only
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* accessed by a single processor instance (the current one).
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*
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* The arch code can provide optimized implementation by defining macros
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* for certain scalar sizes. F.e. provide this_cpu_add_2() to provide per
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* cpu atomic operations for 2 byte sized RMW actions. If arch code does
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* not provide operations for a scalar size then the fallback in the
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* generic code will be used.
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*
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* cmpxchg_double replaces two adjacent scalars at once. The first two
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* parameters are per cpu variables which have to be of the same size. A
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* truth value is returned to indicate success or failure (since a double
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* register result is difficult to handle). There is very limited hardware
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* support for these operations, so only certain sizes may work.
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*/
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/*
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* Operations for contexts where we do not want to do any checks for
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* preemptions. Unless strictly necessary, always use [__]this_cpu_*()
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* instead.
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*
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* If there is no other protection through preempt disable and/or disabling
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* interupts then one of these RMW operations can show unexpected behavior
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* because the execution thread was rescheduled on another processor or an
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* interrupt occurred and the same percpu variable was modified from the
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* interrupt context.
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*/
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#define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp)
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#define raw_cpu_write(pcp, val) __pcpu_size_call(raw_cpu_write_, pcp, val)
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#define raw_cpu_add(pcp, val) __pcpu_size_call(raw_cpu_add_, pcp, val)
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#define raw_cpu_and(pcp, val) __pcpu_size_call(raw_cpu_and_, pcp, val)
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#define raw_cpu_or(pcp, val) __pcpu_size_call(raw_cpu_or_, pcp, val)
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#define raw_cpu_add_return(pcp, val) __pcpu_size_call_return2(raw_cpu_add_return_, pcp, val)
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#define raw_cpu_xchg(pcp, nval) __pcpu_size_call_return2(raw_cpu_xchg_, pcp, nval)
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#define raw_cpu_cmpxchg(pcp, oval, nval) \
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__pcpu_size_call_return2(raw_cpu_cmpxchg_, pcp, oval, nval)
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#define raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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__pcpu_double_call_return_bool(raw_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
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#define raw_cpu_sub(pcp, val) raw_cpu_add(pcp, -(val))
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#define raw_cpu_inc(pcp) raw_cpu_add(pcp, 1)
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#define raw_cpu_dec(pcp) raw_cpu_sub(pcp, 1)
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#define raw_cpu_sub_return(pcp, val) raw_cpu_add_return(pcp, -(typeof(pcp))(val))
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#define raw_cpu_inc_return(pcp) raw_cpu_add_return(pcp, 1)
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#define raw_cpu_dec_return(pcp) raw_cpu_add_return(pcp, -1)
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/*
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* Operations for contexts that are safe from preemption/interrupts. These
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* operations verify that preemption is disabled.
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*/
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#define __this_cpu_read(pcp) \
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({ \
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__this_cpu_preempt_check("read"); \
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raw_cpu_read(pcp); \
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})
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#define __this_cpu_write(pcp, val) \
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({ \
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__this_cpu_preempt_check("write"); \
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raw_cpu_write(pcp, val); \
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})
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#define __this_cpu_add(pcp, val) \
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({ \
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__this_cpu_preempt_check("add"); \
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raw_cpu_add(pcp, val); \
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})
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#define __this_cpu_and(pcp, val) \
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({ \
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__this_cpu_preempt_check("and"); \
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raw_cpu_and(pcp, val); \
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})
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#define __this_cpu_or(pcp, val) \
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({ \
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__this_cpu_preempt_check("or"); \
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raw_cpu_or(pcp, val); \
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})
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#define __this_cpu_add_return(pcp, val) \
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({ \
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__this_cpu_preempt_check("add_return"); \
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raw_cpu_add_return(pcp, val); \
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})
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#define __this_cpu_xchg(pcp, nval) \
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({ \
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__this_cpu_preempt_check("xchg"); \
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raw_cpu_xchg(pcp, nval); \
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})
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#define __this_cpu_cmpxchg(pcp, oval, nval) \
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({ \
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__this_cpu_preempt_check("cmpxchg"); \
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raw_cpu_cmpxchg(pcp, oval, nval); \
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})
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#define __this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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({ __this_cpu_preempt_check("cmpxchg_double"); \
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raw_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2); \
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})
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#define __this_cpu_sub(pcp, val) __this_cpu_add(pcp, -(typeof(pcp))(val))
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#define __this_cpu_inc(pcp) __this_cpu_add(pcp, 1)
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#define __this_cpu_dec(pcp) __this_cpu_sub(pcp, 1)
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#define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
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#define __this_cpu_inc_return(pcp) __this_cpu_add_return(pcp, 1)
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#define __this_cpu_dec_return(pcp) __this_cpu_add_return(pcp, -1)
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/*
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* Operations with implied preemption/interrupt protection. These
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* operations can be used without worrying about preemption or interrupt.
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*/
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#define this_cpu_read(pcp) __pcpu_size_call_return(this_cpu_read_, pcp)
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#define this_cpu_write(pcp, val) __pcpu_size_call(this_cpu_write_, pcp, val)
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#define this_cpu_add(pcp, val) __pcpu_size_call(this_cpu_add_, pcp, val)
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#define this_cpu_and(pcp, val) __pcpu_size_call(this_cpu_and_, pcp, val)
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#define this_cpu_or(pcp, val) __pcpu_size_call(this_cpu_or_, pcp, val)
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#define this_cpu_add_return(pcp, val) __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
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#define this_cpu_xchg(pcp, nval) __pcpu_size_call_return2(this_cpu_xchg_, pcp, nval)
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#define this_cpu_cmpxchg(pcp, oval, nval) \
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__pcpu_size_call_return2(this_cpu_cmpxchg_, pcp, oval, nval)
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#define this_cpu_cmpxchg_double(pcp1, pcp2, oval1, oval2, nval1, nval2) \
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__pcpu_double_call_return_bool(this_cpu_cmpxchg_double_, pcp1, pcp2, oval1, oval2, nval1, nval2)
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#define this_cpu_sub(pcp, val) this_cpu_add(pcp, -(typeof(pcp))(val))
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#define this_cpu_inc(pcp) this_cpu_add(pcp, 1)
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#define this_cpu_dec(pcp) this_cpu_sub(pcp, 1)
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#define this_cpu_sub_return(pcp, val) this_cpu_add_return(pcp, -(typeof(pcp))(val))
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#define this_cpu_inc_return(pcp) this_cpu_add_return(pcp, 1)
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#define this_cpu_dec_return(pcp) this_cpu_add_return(pcp, -1)
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_PERCPU_DEFS_H */
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